Evolution of Improving Acquisition of GPS Satellite Signals for Car Navigation

Takahiko Ikeda, Ayumu Hyodo, and Katsuo Yamada

Abstract:	GPS receivers are becoming compact and less expensive and offer a growing importance as a position fixing device in car navigation. However, there still are some problems in this application due to environmental conditions: frequent blocking of satellite signals by buildings, influence by multipaths, limited availability of satellite signals under elevated motorway, etc. Intensive study was made by using the GPS receiver model GN-72 of Furuno Electric Co., Ltd. for improvement of acquisition rate to make the best use of it as a position fixing sensor for car navigation. Various tests were made by selecting test courses in some typical areas in Japan. Acquisition rate was improved from 70% with orignal version to 90% with improved version on one course and from 80 % to almost 99 % on other courses. Thus, better continuity in position fix was achieved. This paper describes the process of the improvement, simulation to observe status of the improvement and results of field tests.
Published in:	Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993) September 22 - 24, 1993 Salt Palace Convention Center Salt Lake City, UT
Pages:	967 - 974
Cite this article:	Ikeda, Takahiko, Hyodo, Ayumu, Yamada, Katsuo, "Evolution of Improving Acquisition of GPS Satellite Signals for Car Navigation," Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993), Salt Lake City, UT, September 1993, pp. 967-974.
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